Use std::string_view and fmtlib across all libraries (#3402)

- Twine, StringRef, Format, and NativeFormatting have been removed
- Logging now uses fmtlib style formatting
- Nearly all uses of wpi::outs/errs have been replaced with fmt::print() or
std::puts()/std::fputs() (for unformatted strings).
- A wpi/fmt/raw_ostream.h header has been added to enable
fmt::print() with wpi::raw_ostream

wpilibc/src/main/native/cpp/shuffleboard/LayoutType.cpp

@@ -6,6 +6,6 @@
 
 using namespace frc;
 
-wpi::StringRef LayoutType::GetLayoutName() const {
+std::string_view LayoutType::GetLayoutName() const {
   return m_layoutName;
 }

wpilibc/src/main/native/cpp/shuffleboard/RecordingController.cpp

@@ -26,7 +26,7 @@ void RecordingController::StopRecording() {
   m_recordingControlEntry.SetBoolean(false);
 }
 
-void RecordingController::SetRecordingFileNameFormat(wpi::StringRef format) {
+void RecordingController::SetRecordingFileNameFormat(std::string_view format) {
   m_recordingFileNameFormatEntry.SetString(format);
 }
 
@@ -35,7 +35,7 @@ void RecordingController::ClearRecordingFileNameFormat() {
 }
 
 void RecordingController::AddEventMarker(
-    wpi::StringRef name, wpi::StringRef description,
+    std::string_view name, std::string_view description,
     ShuffleboardEventImportance importance) {
   if (name.empty()) {
     FRC_ReportError(err::Error, "{}",
@@ -43,5 +43,6 @@ void RecordingController::AddEventMarker(
     return;
   }
   m_eventsTable->GetSubTable(name)->GetEntry("Info").SetStringArray(
-      {description, ShuffleboardEventImportanceName(importance)});
+      {std::string{description},
+       std::string{ShuffleboardEventImportanceName(importance)}});
 }

wpilibc/src/main/native/cpp/shuffleboard/Shuffleboard.cpp

@@ -14,7 +14,7 @@ void Shuffleboard::Update() {
   GetInstance().Update();
 }
 
-ShuffleboardTab& Shuffleboard::GetTab(wpi::StringRef title) {
+ShuffleboardTab& Shuffleboard::GetTab(std::string_view title) {
   return GetInstance().GetTab(title);
 }
 
@@ -22,7 +22,7 @@ void Shuffleboard::SelectTab(int index) {
   GetInstance().SelectTab(index);
 }
 
-void Shuffleboard::SelectTab(wpi::StringRef title) {
+void Shuffleboard::SelectTab(std::string_view title) {
   GetInstance().SelectTab(title);
 }
 
@@ -44,7 +44,7 @@ void Shuffleboard::StopRecording() {
   GetRecordingController().StopRecording();
 }
 
-void Shuffleboard::SetRecordingFileNameFormat(wpi::StringRef format) {
+void Shuffleboard::SetRecordingFileNameFormat(std::string_view format) {
   GetRecordingController().SetRecordingFileNameFormat(format);
 }
 
@@ -52,13 +52,13 @@ void Shuffleboard::ClearRecordingFileNameFormat() {
   GetRecordingController().ClearRecordingFileNameFormat();
 }
 
-void Shuffleboard::AddEventMarker(wpi::StringRef name,
-                                  wpi::StringRef description,
+void Shuffleboard::AddEventMarker(std::string_view name,
+                                  std::string_view description,
                                   ShuffleboardEventImportance importance) {
   GetRecordingController().AddEventMarker(name, description, importance);
 }
 
-void Shuffleboard::AddEventMarker(wpi::StringRef name,
+void Shuffleboard::AddEventMarker(std::string_view name,
                                   ShuffleboardEventImportance importance) {
   AddEventMarker(name, "", importance);
 }

wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardContainer.cpp

@@ -4,8 +4,6 @@
 
 #include "frc/shuffleboard/ShuffleboardContainer.h"
 
-#include <wpi/raw_ostream.h>
-
 #include "frc/Errors.h"
 #include "frc/shuffleboard/ComplexWidget.h"
 #include "frc/shuffleboard/ShuffleboardComponent.h"
@@ -70,7 +68,7 @@ ComplexWidget& ShuffleboardContainer::Add(std::string_view title,
 ComplexWidget& ShuffleboardContainer::Add(Sendable& sendable) {
   auto name = SendableRegistry::GetInstance().GetName(&sendable);
   if (name.empty()) {
-    wpi::outs() << "Sendable must have a name\n";
+    FRC_ReportError(err::Error, "{}", "Sendable must have a name");
   }
   return Add(name, sendable);
 }
@@ -285,7 +283,7 @@ void ShuffleboardContainer::DisableIfActuator() {
 void ShuffleboardContainer::CheckTitle(std::string_view title) {
   std::string titleStr{title};
   if (m_usedTitles.count(titleStr) > 0) {
-    wpi::errs() << "Title is already in use: " << title << "\n";
+    FRC_ReportError(err::Error, "Title is already in use: {}", title);
     return;
   }
   m_usedTitles.insert(titleStr);

wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardInstance.cpp

@@ -31,7 +31,7 @@ ShuffleboardInstance::ShuffleboardInstance(nt::NetworkTableInstance ntInstance)
 
 ShuffleboardInstance::~ShuffleboardInstance() = default;
 
-frc::ShuffleboardTab& ShuffleboardInstance::GetTab(wpi::StringRef title) {
+frc::ShuffleboardTab& ShuffleboardInstance::GetTab(std::string_view title) {
   if (m_impl->tabs.find(title) == m_impl->tabs.end()) {
     m_impl->tabs.try_emplace(title, ShuffleboardTab(*this, title));
     m_impl->tabsChanged = true;
@@ -77,6 +77,6 @@ void ShuffleboardInstance::SelectTab(int index) {
   m_impl->rootMetaTable->GetEntry("Selected").ForceSetDouble(index);
 }
 
-void ShuffleboardInstance::SelectTab(wpi::StringRef title) {
+void ShuffleboardInstance::SelectTab(std::string_view title) {
   m_impl->rootMetaTable->GetEntry("Selected").ForceSetString(title);
 }

wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardTab.cpp

@@ -6,7 +6,7 @@
 
 using namespace frc;
 
-ShuffleboardTab::ShuffleboardTab(ShuffleboardRoot& root, wpi::StringRef title)
+ShuffleboardTab::ShuffleboardTab(ShuffleboardRoot& root, std::string_view title)
     : ShuffleboardValue(title), ShuffleboardContainer(title), m_root(root) {}
 
 ShuffleboardRoot& ShuffleboardTab::GetRoot() {

wpilibc/src/main/native/cpp/shuffleboard/WidgetType.cpp

@@ -6,6 +6,6 @@
 
 using namespace frc;
 
-wpi::StringRef WidgetType::GetWidgetName() const {
+std::string_view WidgetType::GetWidgetName() const {
   return m_widgetName;
 }